巻号一覧
40 巻 (1979)
- 4 号 p. 169-
- 3 号 p. 115-
- 2 号 p. 61-
- 1 号 p. 1-
40 巻, 2 号
選択された号の論文の6件中1～6を表示しています
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瀬戸 昌之, 高橋 義明, 牛島 忠広, 田崎 忠良1979 年 40 巻 2 号 p. 61-65
発行日: 1979/04/30
公開日: 2009/10/21
ジャーナル フリーThe green frond of Lemna gibba turned into a chlorotic one and always died when cultured in a medium containing cadmium. The ratio of chlorotic fronds to total fronds was greatly affected by the difference in concentration of nutritional minerals even when the concentrations of cadmium in the medium were the same. The cadmium contents of L. gibba were also affected by the difference in concentration of nutritional minerals. The appearance of chlorotic frond was not explicable from the cadmium contents of L. gibba. When cultured in a high concentration of nutritional minerals, the chlorotic frond did not appear in spite of the high content of cadmium in the frond. On the other hand, when cultured in a low concentration of nutritional minerals, the chlorotic frond appeared in spite of the low content of cadmium in the frond.
The protein content of L. gibba was changed considerably by the difference in concentration of nutritional minerals. This change in protein content might be related to differences in the appearance of the chlorotic frond.
To study the effect of a pollutant on an organism, it will be necessary to understand the effect of an environmental condition on an organism as well as the amount of a pollutant accumulated by an organism.抄録全体を表示PDF形式でダウンロード (745K) -
渡辺 信英, 石丸 優, 石田 紀郎, 片山 幸士, 喜多山 繁1979 年 40 巻 2 号 p. 66-73
発行日: 1979/04/30
公開日: 2009/10/21
ジャーナル フリーPolychlorinated biphenyls (PCBs) had been used in industry since 1954. Around Lake Biwa, 16 factories used such materials, and they were detected in many environmental samples from the lake. In this study, the PCB concentration was determined by gas-chromatography in Isaza, in the northern part of Lake Biwa. PCB residues were found in all the samples collected from 1966 to 1976, and the concentrations ranged from 0.413 to 1.53 ppm. PCB residues in Isaza aged 1 are higher than those in Isaza aged 0, and the differences is significant. This difference is thought to be related to the difference of their fat contents. The ratio of highly chlorinated PCB to the total PCB residue in Isaza aged 1 is significantly higher than that in Isaza aged 0. The reason seems to be that low chlorinated PCBs are more easily metabolized than highly chlorinated PCBs. PCB residues in Isaza do not show much decrease even after PCB production was stopped in 1972.抄録全体を表示PDF形式でダウンロード (1095K) -
松島 肇1979 年 40 巻 2 号 p. 74-80
発行日: 1979/04/30
公開日: 2009/10/21
ジャーナル フリーPolynuclear aromatic hydrocarbons (PAH) including fluoranthene, pyrene, 1, 2-benzanthracene, chrysene and 3, 4-benzpyrene (1, 2-benzpyrene), were identified and determined in the range from 0.142 to 0.720, 0.066 to 0.590 and 0.100 to 0.467 ppb in both of water samples with and without filtration and suspended solids collected from the Tama River near the Maruko-bashi respectively. The concentration of these PAH was calculated with the magnitude of ppm on the basis of the weight of the suspended solid.
The extraction efficiency of PAH from the water sample without filtration was 50-75% of the sum of PAH determined in the water sample with filtration and suspended solids. Such a poor PAH extraction efficiency may be due to the adsorption of PAH to the suspended solids. The adsorption of PAH onto the suspended solids takes place more effectively with the greater molecular weight of PAH. This may be partly due to the solubility of PAH in water, which becomes decreases with the increase in molecular weight.抄録全体を表示PDF形式でダウンロード (816K) -
寺井 久慈1979 年 40 巻 2 号 p. 81-92
発行日: 1979/04/30
公開日: 2009/10/21
ジャーナル フリーDenitrified nitrogen in Lake Kizaki was estimated by analysis of dissolved nitrogen and argon. Denitrification in the anoxic layer and that in the oxic layer were confirmed. Vertical distributions of denitrifiers in L. Kizaki were estimated by MPN count method with Giltay's medium. In the period of circulation of lake water, denitrifiers were found throughout the water column, but they appeared discontinuously in the period of stagnation. One of the peaks was found in the oxic layer and the other in the anoxic layer. Forty-four strains of denitrifying bacteria were isolated from the lake in different seasons and at different depths. Taxonomical study was carried out with the isolated denitrifiers at generic levels. All the isolates were Gram-negative rods and motile with peritrichous or polar flagella. Most (34/44) of them were classified among Pseudomonas, some (4/44) among Alcaligenes-Achromobacter. The fluorescent group of Pseudomonas was distributed in rather oxic layers of the lake, while other groups of denitrifiers were found both in the oxic and the anoxic layers.抄録全体を表示PDF形式でダウンロード (1759K) -
今津 達夫1979 年 40 巻 2 号 p. 93-99
発行日: 1979/04/30
公開日: 2009/10/21
ジャーナル フリーSpecies composition of phytoplankton was studied in two groups of irrigation ponds close to Himeji City, Hyogo Prefecture. Sixty-three genera and 112 species were recorded from 12 ponds. The number of species was greatest in August with the highest water temperature and the smallest in cold January in both groups of ponds. A good correlation was found between the occurrence of rooted aquatic plants and the number of phytoplankton species. Ponds with a luxuriant growth of macrophytes generally had the large number of phytoplankton species. In Sara-ike, 43 species of Desmids were recorded.抄録全体を表示PDF形式でダウンロード (1197K) -
金成 誠一, 早瀬 進治1979 年 40 巻 2 号 p. 102-109
発行日: 1979/04/30
公開日: 2009/10/21
ジャーナル フリーThe frictional effect on the period of surface seiches in Lake Biwa has been discussed by TAKAHASHI and NAMEKAWA (1931). They concluded that the seiches of the longest period of 4 hours in Lake Biwa may be considered as a bay oscillation in the southern basin, and the difference of the period between the observed and theoretical one is due to an elongation effect of internal friction of the seiches. The same authors evaluated the linear frictional coefficient, K0 as 0.69cm/sec. However, the above estimation is not consistent with the observed darning coefficient. Such an inconsistency must be due to incorrect positioning of the bay mouth when calculating the theoretical period.
In the present paper, the authors give an estimation of the frictional effect on the period length in consideration of mouth correction, and also introduce a renewal frictional factor, estimated from field survey of diminishing seiches in the southern basin. The evaluation of the frictional factor in the present study gives K0=0.260.05 (cm/sec), which is consistent with the magnitude of the damping coefficient, γ= (2.75.9) ×10-5 (1/sec).
Finally, it is also shown that the square of damping coefficient is inversely proportional to the mean depth of the lake and the period of oscillation in various lakes of the world.抄録全体を表示PDF形式でダウンロード (1007K)
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